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Abstract—A microstrip dual-mode dual-band bandpass filter using stepped impedance resonators (SIRs) is designed for dual-band wireless local area networks (WLANs) applications at 2.4/5.2GHz. By appropriately selecting the impedance ratio (Rz) and length ratio (α) of the SIRs, the harmonic frequencies can be tuned for generating the dual-bandpass response. Based on SIRs, a dual-mode dual-band bandpass filter is designed with one transmission zero. To improve the selectivity, another three transmission zeros in stopbands are created by introducing two stubs in input/output (I/O) lines. Two experimental filters are fabricated. Both simulated and measured results are presented. 1.
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Guo et al. (2010) studied this question.
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